Bridge/This Chain Ids should be exposed as constants on pallet level. (#1085)

* Adding BridgedChainId constant to message pallet

* Addressing PR feedback

bridges/bin/millau/node/src/chain_spec.rs

@@ -70,10 +70,7 @@ impl Alternative {
 		let properties = Some(
 			serde_json::json!({
 				"tokenDecimals": 9,
-				"tokenSymbol": "MLAU",
-				"bridgeIds": {
-					"Rialto": bp_runtime::RIALTO_CHAIN_ID,
-				}
+				"tokenSymbol": "MLAU"
 			})
 			.as_object()
 			.expect("Map given; qed")

bridges/bin/millau/runtime/src/lib.rs

@@ -362,6 +362,7 @@ parameter_types! {
 	pub const GetDeliveryConfirmationTransactionFee: Balance =
 		bp_millau::MAX_SINGLE_MESSAGE_DELIVERY_CONFIRMATION_TX_WEIGHT as _;
 	pub const RootAccountForPayments: Option<AccountId> = None;
+  pub const BridgedChainId: bp_runtime::ChainId = bp_runtime::RIALTO_CHAIN_ID;
 }
 
 /// Instance of the messages pallet used to relay messages to/from Rialto chain.
@@ -397,6 +398,7 @@ impl pallet_bridge_messages::Config<WithRialtoMessagesInstance> for Runtime {
 
 	type SourceHeaderChain = crate::rialto_messages::Rialto;
 	type MessageDispatch = crate::rialto_messages::FromRialtoMessageDispatch;
+	type BridgedChainId = BridgedChainId;
 }
 
 construct_runtime!(